Remove elements of an array by index (trick)
db.users.update({ name: "Foo"}, { $set: { "technologies.2": null } })
db.users.update({ name: "Foo"}, { $pull: { "technologies": null } })
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db.users.update({ name: "Foo"}, { $set: { "technologies.2": null } })
db.users.update({ name: "Foo"}, { $pull: { "technologies": null } })